Duplicating machine



10 Sheets-Sheet 1 Jan. 30, 1940. w. A; KRoPP DUPLICATING APPARATUS Filed Aug. 22, 1938 Jan. 30, 1940. w. A KRQPP 2,188,600

, DUPLICATING APPARATUS Filed Aug. 22, 1938 l0 Sheets-Sheet 2 Jan. 30, 1940. w. A. KRoPP DUPLICATINQ APPARATUS` Filed Aug. 22, 1938 10 Sheets-Sheet 3 rife@ Jan. 30,1940. w. A. KRQPP- 2,188,600N

DUPLICATING APPARATUS Filed Aug. 22, 195s;Y 1o sheets-sheet 4 Jan. 30, 1940. w. A. KROPP DUPLICATING APPARATUS VFiled Aug. 22, 1938 l0" Sheets-Sheet 5 f n 1 l Jam so, 1940. w. A. Knopp i 2,188,600.

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DUPLICATING APPARATUS Filed Aug. 22, 1958 l0 Sheets-Sheet 7 Jan. 30, 1940.

w. A. KROP'P DUPLICAT ING APPARATUS 1o sheets-sheet e Filed Aug. 22, 1938l Jan. 30, 1940. w. A. KRoPP DUPLICATING APPARATUS Filed Aug. 22. 1938 l0 Sheets-Sheet 9 Jan. 30, 1940. w. A. KROPP DUPLICATING APPARATUS Filed Aug. 22. 1958 10 Sheets-Sheet 10 Patented Jan. 30, 1940 -Wiuis A; Kropp, oak Park, 111., assignor to Ditto, Incorporated, 'Cl1icago,lll.,` a corporation of West Virginia Application lAugust 22, 1938,'serial`1vo. 226,080`

' 15 claims. (c1. 1111-132) Thisr yinvention relates to .duplicating apparatus of the type in which the reading matter or other design to be duplicated is carried-in reverse on a gelatin band mounted about a drum to which copy sheets are fed one at a time and pressed by an impression roller or platen into operative face engagement with the band as the drum rotates vfor printing such copy sheets, and it is the object or' the invention to provide an improved form and arrangement of parts by which improved results may be attained.

'Ihe invention is directed particularly to the means'for feeding the sheets one at a time to the duplicating drum, to the means by which the copy sheet is brought into proper adjusted posi'- tion with respect to the design on 'the gelatin band for providing the desired margins on the printed sheet, and to the means by which `theprinted sheets are stripped from the gelatin band. It has been among the objects of the invention to provide 'an improved arrangement -by which tlfie` stripper mechanism can be thrown out of. position so as to provide for a sheet to passa plurality of times between the drum and the platen,

andto provide improved means for supportingthe platen in operative position and alternatively for moving the platen out of operative position with respect to. the drum. A

1t is another object of thisinvention to improve apparatusof this type in sundry details vhereinafter pointed out.v The' preferred means :by which the-several objects' have been accom- -plished are illustrated in the accompanying draw- ,of the partsas shown in Fig. 1.

` Fig. 4 is a view similar to Fig. 3 butshowing :a changed position of some of the parts. l

Fig. 5 .is a vertical sectional view takenl substantially at theline 5 5 of Fig. 1. l

Figs. 6, '7, and 8 are horizontal sectional .views l taken substantially at theline l6 6, the line 1 1,

and the line 8 8, respectively, of Fig.3. l Fig. 9 is a vertical sectional view takensubstantially at the line 9 9 of Fig. 8. i

Fig. 1001s a. View similari-.0 Figs with certain' ofthe parts omitted and showing a changed position of certain of the parts. i

the line l8 l8 of Fig. 15.

" Fig. .11 -isa vertical sectional view taken at thevr l li`ne,ll ll of Fig. 5.

Figs. v1'2 and 13 are views similar to Fig. 11 but showing changed positions ofthe parts.

Fig. 141s a vertical sectional view taken at the 5 Fig. 15 is a View similar to Figfl4 but showing thepar'ts held by axcam in changed operative position. n 1 Fig. 16 is a'vertical sectional view taken at the 10 line Iii-16,01 Fig. 14..v i A j Fig. 17 is a horizontal sectional view taken'at the line Il ll of` Fig. 14; and

Fig. 18 is a horizontal sectional view taken at Referring now to the several gures of the *15. drawings, in which corresponding parts are indicated by thesame reference characters, 30 indi- 4`cates a frame which in the arrangement shown comprises standards V43| and 32 oppositely ar-gor ranged (see Fig. 2) supporting adruni 331b'y'` means of two short aligned'shafts 34 and 35. The drum33 issegmental in Aiormas'isusual in connection with gelatin-process, duplicating machin'es, being provided Withjsuitable mountingj25 means of anyr approved type, asis indicated diagrammatically in Fig. l, for-mounting a gelatin band 36 about the -face portion of thedrum, the y drum at the .leading and rear edges of the face portion being providedwith rollers 3l for engag- 30 fling the gelatin band (see Figs. 1'-,.11 and 14) The-:"1

arrangement issuch that the gelatin band 36 K canv be shifted as desired circumferentially of lthe vsegmental face portion of the drum.

Means is provided for driving lthe drum 33, as 35 .is .best shown. in Fig. 2, vcomprising a drive pulley l 38 connected" by means of a belt 39 'with any suitable source of power, saidpulleyl.being.

V rotatably` mounted upon the standard 3l of the frame by means of a'short stub shaft. 40. The

pulley 38 vispro'videdat one side face with a 40 'pinion 4l. rigidly connected' therewith 'in position to meshl y with a large gear 42 rotatably itsv outer facev portionfvvith4 a ratchet wheel 14H45 which is adapted to be engaged by a pawl v115 pivotally mountedupon the adjacent face of a large gear 46 fixedly mounted upon the shaft34. 4.sofas toV rotate with'the drum 33.?No means isb5` shown in the drawings for controlling the posi-*f* ytion, of the pawl 45 by which power may be transmitted 4lfrom the gear.42 to the gear ,411?.`

y Control meansvof any approved type isto be employed as is well understoodvin the art for regu- 4 55v lating the position of the pawl 45 in accordance with the requirements. Such control means are not shown since they form no part of the present invention.

Upon the opposite end of the drum from that at which the gear d6 is mounted thereon, vI have provided four cams 4l', 48, 49 and 50, rigidly mounted upon the drum soas to rotate therewith for purposes as hereinafter described. Over the operating parts at opposite ends of the drum 33,

I have provided sheet metal housings 5I of any' approved type, as is best shown in Figs. 1 and 2.

At the rear end of the machine (atthe rightl in Fig. l), I have provided extending frame bars 52 connected with the framework 3Q for supporting a table 53 thereon, together with means for feeding the topmost sheet from a pile of copy sheets resting on the tableAt opposite sides of the table, operating mechanism is provided in connection with the feed of the sheets from the table, and for covering such operating mechanism in part I have provided sheet metal housings 5&1

at opposite sides of the machine, as is best shown in Figs. l and 2. As is `clearly shown in Fig. 5, the table 53 is preferablyprovided with yadjustable side margin bars 55 atv opposite'sides of the table Vfor holding the sheets in evenly piled relation to each other. In the arrangement sho-wn, the margin bars 55 are held in frictional engagement with the table 53 by means of coiled springs'iif,

the arrangement being such that the marginbars are readily movable inwardly and outwardly with respect to each other to` correspond with thel lmounted upon one of its arms in position to be engaged by the cam 5t at a predetermined point ,in each rotation ofthe drum 33., The downwardly extending arm of the belllcrank lever '51 is connected oy means fof a link '50 with the lower end of an arm Bi which is pivotally mounted upon the framememberf at oneside of the table 53. "Ihe arrangement'is such that ras the drum 33 rotates in clockwise direction from the vposition as shown in Fig. S'theroller 59 and the figure. 'movably mounted arm 6I and the lower end portion of the frame arm 58`serves to swing the for permitting such result. An eccentric stop debellcrank lever 5l are displaced Vincounterclockwise direction in Vsaid Fig. 3 for swingingv the arm 6! also in counterclockwise direction in Asaid A coiled spring 62 connectedbetween the movably mounted arm 6! in clockwise direction as soon as the cam 59 has cleared the roller 59 vice (i3 is adjustably mountedupon the frame member 52 in position to engage the edge of the arm 6! for limiting the moverncntrof said arm in clockwise direction in said Fig. 3.

At opposite sides of the table 53, I have provided frame arms Glrising from4 the frame members 52 respectively .for supportinga drive 'shaft in position across the table: in upwardly spaced relation thereto. In the arrangement shown, the drive shaft is built up from. a plurality of parts,

` comprising a short shaftsection 66 which is journaled in the upper end of ,one of the frame arms '64, and a long sleeve member 58' removably mounted at one end on said shaft section 56 so as to rotate therewith. At its inner end, the sleeve member 68 is slidably mounted upon a shaft secl tion t9 which in turn is rotatably mounted in the side wall of a housing 'It as hereinafter described, the sleeve member (i8 and the shaft section (5S .beingconnected so as to rotate together. By this arrangement, the 'shaft 59 is caused normally to rotate withwthe shaft section 66, but the two shaftsare adapted very quickly and easily to be "disconnected from each other by a sliding movement of the tubular member 58 toward the housing.

The means for driving the shaft comprising the sections (i5 and 69 includes a pinion 'i6 operatively mounted on the shaft section i155 so as to drive said shaft section in one direction but to rotate free of the shaft in the opposite direction, said pinion 'i6 being in mesh with gear teeth 'll onthe upper end of the plvotally mounted arm iii'. The "arrangement is such that upon a stroke of the 'arm' iii in counterclockwise direction in Fig. 3 the shaft is driven in clockwise direction.

Themeans for supporting the housing HJ in position comprises a sleeve 8i rigidly connected at its inner end'with one side wall of the housing Hi in alignment with'the shaft section 69. At its oppositeend, the sleeve 8l has a releasable connection with the upper end portion of the adjacent frame arm Gd. yThe arrangement of the shaft comprising the sections @5 and 69 and 'the connections of said shaft as above described 'with the housing l0 and sleeve 3l are such as to `hold the kparts strongly in operative' 'position during the operation of the machine. `When the operator desires, however, the shaft and connected partsv can be very quickly and easily re- 'moved from position. For accomplishing this purpose, the vsleeve'fil isrst moved toward the housing'iil-for disengagement from'the shaft-seci' tion "55, and the whole assembly is then moved toward the leftfor freeing the sleeve 8l from `the` frame.

Within the housing iii, in the arrangement shown, 'I have provided driving connections betweenthe shaft sectionand a short shaft 8l 'which-extends through the side walls of the housing 10 and has rollers 88 andi-S dxedly mounted.

lupon its outer lend portions. The arrangement "is such that when the shaft sections @E and 69 vare drivenin clockwise direction in Fig. 3 byrea- `son-of -anwoperative stroke of the arm I6l .in `oounterclockwise direction, the rollers. .-33 and 89 are likewise driven, in clockwise direction in said Fig. 3 for moving the topmost sheet of a pile of .sheets .9B toward the left. Upon the return movement of thearm lily by the spring B2, jthe free-wheeling connection as above described permits the rotation of the pinion 'it with respect to the shaft section 56 so as not to change the position of the rollers 88 and 89.

In the arrangement as above described, the housing 'Iii serves as an arm for spacing the rollers 88. and 89 from the 'shaft section '58, such arm extending across'above the table in spaced lrelationto the table, the rollers 88 and 89 being in raised4 position VAadjacent to the platenroller H2 as shown in Figs. 11 and 12. For limiting the upward movement of the-stop device |23, I have provided a bumper |28, preferably vin the form of a block of rubber,- carried by the. arm |26 in position tojengage van eccentric |29 adjustably mounted lin position upon one of the frame members 5.2, fas isi-best `shown in Figs. 11 and 13.

For moving the stop device `i 23 out ofits raised positionas-'shownzin Fig. 1l .to its lowered position asshown in Fig. ,13, in timed relationto the movement of the `drum,1 have .provided an arm adjustably mounted in position upon the rock shaft 25 (seef'Fig. 7), such arm being providedfzuponits freefend'witha-iroller 53| fin position toV engage the` cam-48 'asthefdrum rotates.

"As is bestshownrinFigs. e and ,7,A the arm Hifi* is adjustable with'respeot totheshait |2-5-by means of. a screw v|32 carried by a short arm |33 xedly mounted -upon theshaft 1:25,- the screw |32 being-positioned lwithin 4a.- circular slot i3d formed in the arm |311; Upon loosening the screw |32, the-arm |39 can be moved-to the de- 'sired angular position with respect to the yarm "|33, the -screw E32-when tightened being adapted tovhold the arms in adjusted position. By an adjustment of the arm i353 with respect to the short arm |33, the 'position of Vthe roller |3| with respect to the margin `-bar `|23 vis varied. The `adjustment is preferably to be such thatthe margin bar shall be held in operative ,position 'as' shown in Fig. 12 until the rollerl Si'v andthe gelatin band "33 are brought into close proximity to the margin bar. The roller 53|V and cam 48 `are then to operate in accurately Ytimed relation for displacing. the margin bar 123 ahead 'of the roller 3? so as to'prevent the gelatin band from being brought into engagement with the margin bar.

-When the drum -33 reachesthe position as shown in Fig. 12, Vwith'y a copy sheet'S in position as shown Ainsaid gure, the gelatinjband 35 is brought into operative engagement with. the

copy sheet so as to cause the sheet to adhere to the band. Upon the continued rotation of the drum, the copy sheet 93 bonded tothe gelatin band is causedto advance with the band. At the initial contact of the band iiwith the copy sheet as shown in Fig. l2, the zonej-of engagement vbetweenithe two-isv quite limited and the effectiveness'of the hold on the sheet is correspondingly small. `As the drum, advances, however', from theposition as shown in Fig. 12, `the loop'in the sheet 93 at v|22 is eliminated so as to` straighten out the sheet into 4 the ycondition as shown in- Fig. 13. By the' time when the looped `portion Yhas been straightened, vthe `Zone of engagement F65' of the sheet v23 and thefgelatirrband 35 has been very considerably increased'with a corresponding increase in the strengthof the hold on the sheet so as Ato enable theband'to draw thesheetforward-without danger of tearing thesheet orl of destroying the bond between 'the 'sh'eetzand the band.

As has been described above,V the nrollers "|38 and 89 are adapted to give the sheet' 93 itsfiniti'al forwardv movement, 'serving to carry 4the-'lsheet` Yinto-thebiteofthe roller-stilland-95.y l'Ifhe sheet drive thesheet. f The .'means for stripping' the ,'copygsheetsfrom 'as 4is:clearlyshown in Fg.v2. l y

:Foricooperation-With the stripper j roll |35, 1,40, vhavefprov-ided a stripper lbarilll lextending lon- --gitudinally f`of. ;thee1drum'adjacent to the roller rock shaft |25 .extending across the machine.

The rock shaft |25 is Iiprovidedxwith an arm |26 (see Figs. 11 and-12) whichfis' connectedy lby a spring |21 with the framework underneath ythe table 53, `as is :best shown in'Fig. 1, such spring serving ynormal-ly to 'holdthe stop device remainsthen in .thisvpositionwuntil the 1rollers Eland are actuated for drawingrthesheet forward independently fof. they-rollers -83 `and 89,

*such rollers 88 and .-89 being adapted to rotate` independently of their -normal driver so asnvot :5.

y-to 'interfere with the forward movement of the -sheetlwhich isfcarriedrbytherollers Stand: 9 5 into` engagement Awith the platen* roller l I2 and .-the stop-device 12.3.2

Theisheet 93 is ...again brought toa'rest momentarily; in .the `position A#of .1,0 the sheet-as 'shown in Fig. `1`2until abend-is 'establishedg-betweenfthe copy `sheet `and thje gelatin Aband 3 3 Iassaloove 'described, whereupon the' sheet :is4 drawnforward by the withgboth y, `the'roll'ers 34 and-35 and the;rollers isyand-l` being Adrivenfby the isheet instead of 'serving to engagement with the gelatin bandcompr-ises a ed in .position Aby Ymeans oa-shaft |33; Which-is adjustably mounted in.` position .within eccentric (19 bearing blocks 1h39 Icarried-by. the vframe'.,members =3| :andi32. .By-an adjustment civlth'eeccentricj members |39, the spacing f between theA roller and the-drum cannbe regulated, as will ybe readily understood. Therroller |35 is rcontinuously driven 5 4vduringthe operation-ofl the Amachine by means vofi 'a pinionllllfifixedly vmounted uponthe-shaft |138 in Spositionfto mesh with the large gean,

|35,'a's is best.showninFigsnZland 15. .'lhebar '-IMI is .preferably-in the l'formof a roller rotatably mountedfbetween arms AM2 which are xedly T45 mounted vupon a rock @shaft M3 y(see` Fig. 17).m 'Said arms |42 iarezfmounted. in position upon `the rock shaft |43 byfrneansof blocks: lliliwhichlextend'-downwardlyin the iform of arms below the rock shaft,being:provided with-bumper mem- '50 bers .m5, preferably4 of rubber, on" their front.l

`faceslinposition toi'engage atie-rod |133 .for lirniting the movement of .the stripper bar Mitoward thedrum. vvAs'isclearly shown in Fig. 17, the-rock `shaft M3 is rotatably. 'mountedwin position ley-means, of .eccentric bearing blocks |41 which areadjustably mountedinitheframe mem-l crank'lever |48 -is' xedly mounted upon .the rockmo shaft |43, being =mounted in,` position upon `the `rock shaft through the medium vot a blockll).

The downwardly extending armof?` the Abellcrank .lever 148 .is-provided with apin |4551' extending fromiitsgface, such-pin having'a.spring l |56 connected therewith :for holdingthebe'llcranklever gnormally` turned .tothe limit of its motion in clockwise direction irl-"Fig, 14,. the

-Lspring f|15-being connectedlatits opposite end `with'fthe frame memberv32by means of; a 9111.510 i |5|, as issbest shown in Fig. 2.1,Th`eother`arm d 'of lthe -bellcrank lever^`|48 extends :toward the drum, 'being provided l at its fend'portion with a foam' roller |52 position to engage :thecamfll at timed intervals in the rotation vof thedrum. 'elli 45 sleeve.

vices are provided for holding the parts in such changed position, comprising a pin. 9| in fixed position on the frame arm 64 and a lug 92 which is mounted rigidly in position with respect to the sleeve. i

In Fig.` 3 the roller 59 is shown in engagement with the cam 50 just ready for its operative stroke for forwarding the topmost sheet of the pile 90 towardv the left in said figure. In `Figure 4, in which the parts are shown in the changed position which they assume upon a very slight advance movement of the drum from the position as shown in Fig. 3, the bell-crank lever 51 has been completely displaced for moving a sheet 93 from the pile 90 so as kto bring its leading edge into the bite of `two forwarding rollers 94 and 95 which are rotatably mounted upon the frame members 52 just in front of the table 53.

The rollers 94 and 95 are mounted in cooperative relation to each other for forwarding a sheet betweenv them, the roller 95 being driven in the construction illustrated and the roller 94 being driven by frictional engagement with the roller 95 or with the interposed sheet. The means for rotating the feed roller 95 (see Fig. 6) comprises a pinion 96 xedly connected with the roller by means of a head 91 and a pin 98, such pinion 96 being in operative engagement with a gear 99 fixedly mounted upon a short shaft which in turn is rotatably mounted in the framework. At its outer end, the shaft |00 is provided with a pinion |0I which mesheswith a gear |02 rotatably mounted upon a stub shaft |03 carried by the framework. Upon the stub shaft |03 adjacent to the gear |02 there is mounted a sleeve |04 of substantially the same size as that of the hub of the gear |02, said sleeve |04 and the aligned hub having a coiled spring |05 mounted thereon in such relation as to be tightened upon the sleeve and the hub when the sleeve |04 isdriven in counterclockwise direction in Fig. 3 so as to cause the gear |02 to rotate in that direction with the The arrangement is such thatwhen the sleeve |04 is rotated in clockwise direction in said Fig. 3 the spring is loosened so as not to apply power to the hub of the gear |02. As a result of this construction, when the sleeve |04 is rotated in counterclockwise direction in Fig. 4 the `roller 95 is driven in the same direction so as to cooperate with the roller 94 for forwarding the sheet 93 toward the left.

For actuating Vthe sleeve |04, an arm |06 is mounted thereon having a roller |01 rotatably mounted upon one end portion, such roller standing normally in the path of the cam 49. A spring |08 connected at one end with the arm |06 and at its opposite end with the frame arm 58 holds the arm |06 normally in the position as shown in Fig. 4, with a lug |09 on said arm standing in engagement with a bumper I I0 preferably formed of rubber and supported by a tierod III. As the drum 33 carries the cam 49 in clockwise direction from the position as shown in Fig. 4, the rollers 94 and 95 are given operative rotary movement for advancing the sheet 93 toward the left.

A short distance below the rollers 94 and 95 in advance of said rollers, I have provided a platen roller II2 which isr rotatably mounted between two arms I I3 which are pivotally mounted upon the `framework by means of pivot pins H4, as is best shown in Figs. 9 and 10.v Springs II5 connected at their lowerl ends with the lower ends vof the arms I I3 and at their upper ends with a rockshaft II6 hold the arms II3 normally turned to the limit of their motion in counterclockwise direction in Fig. 9 so as to hold the platen roller I I2 in impression relationship to the drum 33 and the gelatin band 36 mounted thereon. For limiting the movement of the roller II2 toward the drum, I have provided eccentric devices II'I adjustably mounted in position upon the Vframework so as to be engaged by the lower end portions of the arms I I3, as is clearly shown in said Fig. 9.

For moving the platenA roller I| 2 toward the right from the positionA shown in Fig. 9 to the position as shown in Fig. 10 out of impression relationship with the drum, I have provided a lever II8 Xedly mounted upon the shaft II6. Depending from said rock shaft II6, there are two arms II9 which are flexibly connected by means of links with the lower end portions of the arms II3, the arrangement'being such that when the lever is swung from its solid line position as shown in Fig. 9 to its solid line position as shown in Fig. 10, the arms II3 are swung in clockwise directions about the pins ||4 so as to carry the platen roller |I2 out of impression relationship to the drum. This movement of the lever II8 carries the springs II5 into slightly past centers position with respect to the pivotal connection between the` links |20 and the arms I9. The result is that the springs II5 are effective for holding the platen vroller I l 2 against the drum in the position of the parts as shown in Fig. 9 and are effective alternatively for holding the platen roller in spaced relation to the drum as shown Ain Fig. 10.

In the description above, the springs II5 are described as holding the platen roller H2 in engagement with the drum. Such statement is correct with respect to the conditions when the segmental drum is in position to be engaged. When the drum has been rotated out of position to have its face portion engaged by the platen roller (see Fig. 11), the springs II5 then hold said roller in position for engagement with the drum when the drum in its rotation again reaches the position as shown in Fig. 12.

From a study of the parts as shown in Fig. I13, it will be appreciated that the line connecting the axis of the drum 3,3 with the axis of the roller II2 stands at approximately a right angle to the line connecting the axes of the rollers 94 and 95. As a result of this arrangement, the rollers 94 and 95 normally direct the sheet 03 approximately toward the center of the drum 33 rather than toward the point of contact between the drum and the platen roller. For diverting the sheet 93. as it is forwarded by the rollers 94 and 95 from` the normal path toward the axis of the drum so as to cause .the sheet to pass into the bite of the drum and the platen roller II2, I have provided a curved guide I2I, as is clearly shown in Fig. 12, directly in the path of the advancing sheet arranged so that the sheet by following the contour of the guide is given the form of a loop, as is shown at |22 in said Fig. 12. The sheet advancing from the guide I2I passes into Contact with the platen roller II2 and thence into engagement with a margin stop device |23 which is movably mounted in position a short distance in advance of the platen roller I l2. The stop device |23 is in the form of a trough, being mounted in position adjacent to the platen roller II2 bymeans of arms |24 which are` xedly mounted upon a VAs is best showni in Figs. 14 and 15, the camx roller |52 is adjustable with respect to the bellcrank lever |48, being secured in position by means ofa pin |53 which is slidably mounted in -`a slot |54 in the arm of the lever. The arrangement is such that the spring |50 normallyholds the roller |52 in position for engagement with the cam 41, as shown in Fig. 14, the stripper bar such position as to enable the extending end portion ofl the copy sheet 93 to move toa pointy opposite the outer face of said` stripper bar yasI indicated in said two figures.

In the normal operation of the machinathe stripper bar |4| is held in the position asshown in Fig. 14 until the copy sheet 93 stands op- -posite the face of said bar |4|, when the cam left in said figure. Such movement of the stripper bar |4| forces the loose end portion of the copy sheet 93 into engagement with the rotating stripper roller |35 by reason of which the copy sheet is caused to move toward the left into the position as shown in Fig. 15. As the drum continuesto rotate, the copy sheet is continuedin its movement toward the left until `it is completely stripped from the gelatin band 39 and delivered to the tray |31. For turning the Aend of the copy sheet 93 downwardly into the tray, I have provided a guide plate |55 which is secured between the frame standards 3| and 32 at their upper end portions as is clearly shown `in Fig. 2. The arrangement is such that upon each succeeding rotation of the drum the leading edge of the copysheet normally is stripped-from the gelatin band in the mannerdescribed.

In my improved machine, I have provided means for throwing the stripper mechanism out of operation. This means comprises a lever |56 (see Fig. 2) mounted adjacent to the lever ||8, Such lever |56 in the arrangement shown being loosely mounted upon the 4rock shaft H6, as is best shown in Fig. 8. -As is clearly shown in Fig. 3, the -lever |56 is provided with a downward extension |51 below the rockshaftv |16, such extension |51 being pivotally connected'by means of arivet |58 with -the rear end portion of a link |59 which extends forwardly along-.the side of the machine asis best shown in Fig.- 1. At its forward end the link |59` is provided with a longitudinally extending slot |69 therein which is slidably mounted upon a pin |6| carried A.by the adjacent frame member 32 (see Figs. 14

and 15). As is clearly shown in Fig; 18, the' link |59 is formed `in two sections inv order to provide a laterally extending arm |62 at an intermediatepoint along the link, such laterally eX- tending arm 62 being provided at its end portion i with a set-screw |53 adjustably mounted'in position therein for operative engagement with the pin |49 carried by the bellcrank lever |48 as above described. The arrangement is such that when thelever |56- is moved in counterclockwise direction in Fig. 3, the link |59 ismoved rear-l wardly for bringing'the set-screw |63 into op- 'erative engagement with the pin |49 so as to swing the bell-crank lever |48 in counterclockwise direction in Fig. 14y for carrying the cam roller |52 out of engagement with the cam 4T and for carrying the stripper roller bar |4| from Vthe position as shown in Fig. 14 to substantially the position as shown in Fig. 15. With the stripper bar |4| held in the position as shown in said Fig. 15, the ,drum` 33 is enabled to carrya copy As soon as the pressure upon .the

carry the cam roller |52 and the stripper bar'` |4| again into position for normal operation. roller I4! standing under such circumstances in yIt is believed toy be unnecessary to vdescribe further in detailthev operation of. the machine yor any of the parts. When the stripper mechanism isheld out of operation by pressure upon the lever i56 as kabove described, feed rollers 88 and 99 fare preferably swung upwardly and backwardly outoi engagement with the pile of sheets so as to prevent the delivery of additional'sheets tothe drum while a sheet is beingcarried around for a repeated impression The arrangementfis such that all of the remaining operations-can be carriedout withoutbad effects-'during the time the stripper mechanism is thrown .out of operation, such parts being `adapted to runidly in the absence of` additional copysheets .being By the use of my improvedy apparatusgllhave been enabled to obtain very satisfactory results in the matter of the handling of the Vpaper for rapid and accurate-work..-y i Y,

While I prefer `to employ the form and arrangement of parts as illustrated inthe drawings and as above described,`it is to be understood that my invention is not limited to the form and arrangement as shown exceptso far as the claims maybe so limited, it being understood that changes might well` be made in the lform and arrangement of the parts without depart- .ing from the spirit of my inventionY Iclaim: I

'1. In a duplicating machine, the combination i of two rotary members adapted to rotate in operative engagement with each' other, means for rotating said rotary members, two rollers rotatably mounted adjacent tosaid rotary mem` s so as to enable said first-named rotary members `to acquire an effective grip on thel sheetwhile taking up the slack, and means for applying power to said rollers intermittently during -the rotation of said rst-named rotaryl members for` 55 forwarding a sheet to said iirst-namedrotary members. i

2. In ar duplicating machine, the `combination of two rotary members adapted to rotate inoperative engagement with each other, meansfor rotating said rotary I members, two rollers. yro'-` tatably mounted adjacent to said rotary members-` also in cooperative relation toi Aeach other forv forwarding a copy sheet and-arranged so that their line of centers stands at a substantial angle to the line of centers of saidv first-named rotary members, guiding means for directing the copy sheet into the form of a bowed loop vin rpassing from said rollers` to Vsaidirst-named rotary members, and means for applying power f to said-rollers intermittently during the rotation;

of said first-named rotary members for forwardi ing a sheet tosaid first-named rotary members.

3. In adupli'cating machine, vvthe combination o ftwo rotary members adapted to rotate in operative' ven gagementwith each other, means forrotating said rotary members, two rollers rotatably mounted adjacent to said rotary members also in cooperative relation toeach other for forwarding a copy sheet and arranged so that their line of centers stands at a substantial angle to the line [of centers of said first-named rotary members,

means comprising a curved plate in position to be engaged by a sheet forwarded by said two 4rollers and shaped to deflect the sheet from its normal path in the form Vof a bowed loop extending to said first-named two ,rotary members, and means for applying power tosaid two rollers intermittently during the rotation of said firstnamed rotary members for forwarding a sheetto said rotary members and arranged to stop the rotation of said rollerswhenthe leading portion of said sheet ahead of said loop stands in position to be gripped by said rotary-members.

4. In a ,duplicating machine, the combination of a segmental drum, means for rotating said drum, a platen roller rotatably mounted adjacent to said drum so as to be rotated by the drum when in operative engagement therewith, two rollers rotatably mounted adjacent to said drum also in cooperative relation to` each other for forwarding a copy sheet toward the drum, a curved guide in position to'be engaged by said sheet for deiiecting it into substantially tangential position between vthe drum and the platen so as to provide a loop in the sheet, a margin stop member normally held yieldingly in position to engage the forward edge of va sheet extending a short distance past said platen roller, means for driving said two rollers for forwarding a copy sheet past said platen roller to said stop member just prior to the operative engagement of said segmental drum with said platen roller, and means for withdrawing said stop member from the path of said sheet for preventing contact of the stop member with the face portion of the drum.

5. In a duplicating machine, the combination of a segmental drum, means for rotating said drum, a platen roller rotatably mounted adjacent to said drum so as to be rotated by the drum when in operative engagement therewith, two rollers rotatably mounted adjacent to said drum also in cooperative relation to each other for forwarding a copy sheet tothe drum and platen roller, a

vmargin stop member normally held yieldingly in position to engage the forward edge of a sheet extending a. short distance past said platen roller, an arm movably mounted adjacent to said drum, means actuated by an operative stroke of said arm for driving said two rollers in the direction for forwarding a sheet past said platen to said sto-p member, means rotating with the drum for giving said arm an operative stroke for advancing said sheet just prior to the operative engagement of said segmental drum with said platen roller, and means for withdrawing said stop member from the path of said sheet for preventing contact of the stop member' with the face portion of the drum.

6. In a duplicating machine, the combination of two rotary members adapted to rotate in operative engagement with each other, means for-rotating said rotary members, two rollers rotatably mounted adjacent to said rotary members also in cooperative relation to each other for forwarding a copy sheet to said first-named rotary members, means adapted by engagement with a sheet being forwarded by said rollers to said first-named rotary members to provide an excessive length of sheet portion interposed so as to enable said firstnamed rotary members to acquire an effective grip on the sheet while taking up the slack, and means for applying power to said rollers intermittently during the rotation of said first-named rotary members, comprising an arm movably mounted adjacent to said first-named rotary members, means actuated by an operative movement of said arm for driving said two rollers in the direction for forwarding a sheet to said first-named rotary members, and means adapted at timed intervals during the rotation of said first-named rotary members to give said arm an operative stroke for advancing the leading edge of a copy sheet from a position between said two rollers to a position between said first-named rotary members.

7. In a duplicating machine, the combination of a segmental drum, means for rotating said drum, a platen roller rotatably mounted adjacent to said drum. so as to be rotated by the drum when in operative engagement therewith, two rollers rotatably mounted adjacent to said drum also in cooperative relation to each other for forwarding a copy sheet to the drum and platen roller, means adapted by engagement with a sheet being forwarded by said rollers to provide' an excessive length of sheet portion intervening 'between said two rollers and the platen roller so forwarding a copy sheet to said first-named ro- "f tary members, means adapted by engagement with a sheet being forwarded from said rollers to said rst-named rotary members to provide an excessive length of sheet portion intervening so as to enable said first-named rotary members to acquire an effective grip on the sheet while takingup the slack, a margin stop member normally held yieldingly in position to engage the forward edge of a sheet extending past said two rollers for assisting in holding said sheet in its looped formay tion, means for driving said two rollers for forwarding a copy sheet past-said rotary members into engagement with said stop device at timed intervals during the rotation of said rotary mem- `bers, and means for withdrawing said stop member from the path of Vsaid sheet promptly following the formation of said loop.

9. In a duplicating machine, the 'combination of a segmental drum, means for rotating said drum, a platen roller rotatably mounted adjacent to said drum so as to be rotated by the drum when in operative engagement therewith, two rollers mounted adjacent to said drum also in cooperative relation to each other for forwarding a copy sheet to the drum and platen roller, means adapted by engagement with a sheetbeing forwarded from said two rollers to said drum and platen roller to provide an excessive length of sheet portion intervening so as to enable said drum and platen roller to acquire an effective grip on the sheet while taking up the slack, a margin stop member normally held yieldingly in position to engage the forward edge of a sheet extending a shoit distance past said .platen roller for assisting in holding said sheet in its looped forwardinga copysheet to said drum, a platen' roller rotatably mounted in position to press a copy sheet into operative engagement with the` drum, means for applying power to said two rollers during a portion of each successive rotation of thedrum for rotating said two rollers in the direction for forwarding a sheet to the drum, and means comprising a spring movable past centers for holding said platen roller in operative engagement with said drum or alternatively in spaced relation to the drum. f

11. In a duplicating machine, the combination of a segmental drum, means for rotatingsaid drum, an arm swingingly mounted adjacent to said drum, a platen roller rotatably mounted on said arm so as to be rotated by the drum when in operative engagement therewith, two rollers rotatably mounted adjacent to said drum in cooperative relation toi each other for forwarding a copy sheet to the drum and the platenroller, means for driving said two rollers during a portion o-f each rotation of the drum, and means comprising a spring connected with said arm and movable past centers for holding said platen roller in operative engagement with said drum or alternatively in spaced relation to the drum;

12. Ina duplicating machine, the combination of a segmental drum, means for rotating said drum, a platen roller rotatably mounted adjacent to said drum so as to be rotated by the drum when in operative engagement therewith, two rollers rotatably mounted adjacent to said drum also in cooperative relation to-each other,l

for forwarding a copy sheet tothe drum and platen roller, means adapted by engagement with a sheet being forwarded by said rollers to provide an excessive length of sheet portion intervening between said two rollers and the platen roller so as to enable saiddrum and platen roller to acquire an effective grip on the sheet whilel taking up the slack, means for applying power to said two rollers during a portion of each successive rotation of the drum for forwarding a sheet to the drum, and means comprising a spring movable past centers for holding said platen roller in operative engagement with said drum or ,alternatively in spaced relation to the drum.

13. In a duplicating machine, the combination of a drum, means for rotating said drum, a table adjacent to said drum, a shaft rotatably mounted in horizontal position above said table, an arm swingingly mounted on said shaft and extending therefrom above said table in spaced relation thereto, a roller rotatably mounted on said arm so as to engage successive top sheets of a pile of sheets on said table, means for driving said roller from said shaft arranged to permit the arm to move upwardly and downwardly without interfering with thel drive of the roller, means for driving said shaft in one direction for causing the roller to move a sheet edgewise from the pile but adapted upon actuation in thev oppostationary, a pinion on said shaft, a second arm pivotally mounted on said table having gear teeth on its upper end engaging said pinion, a bellcrank lever pivotally mounted below said table, means rotating with said drum adapted upon each, rotation of the drum to give said bellcrank lever a quick operative stroke, andA connections between said bellcrank lever and said second arm' adapted upon an operativestroke of said bellcrank lever to swing vsaid second arm for rotating said roller in the direction for'moving the topmost sheet of said piletoward said drum and arranged so that when the application of power -by said bellcrank lever ceases said connections cause saidsecond arm to swing inthe opposite direction into normal operative position with respect to the shaft and roller ready for forwarding another sheet from said pile.

14. In a duplicating machine, the combination of a segmental drum, means `for' mounting a gelatin lmember on said drum, means for applying a copy sheet to said gelatin member with an end portion extending beyond said member, a stripping roller rotatably mounted in adjustable rsite `direction tol permit the roller to remain eccentric mounting means in slightlyspaced relation to said drum so as to be movable toward and from the drum, a' second roller rotatablymounted in position substantially opposite the inner face of said stripping roller and ymovable bodily toward said stripping roller, and means for moving said second roller outwardly lin such timed relation to the yrotation-of the drum as to carry the loose extending vend'p'ortion of said copy sheet into rm engagement with saidstripping roller for removing the copy sheet from engagement with said gelatin member;

` 15. In a duplicating machine, the-combination of a segmental'drum, means for mounting a gelatin member `on said drum, means for applying a copy sheet toy said gelatin member with an end portion extending beyondl said member,

sheet intofrm engagement with said stripping roller for removing the copy sheet from engagev ment with said gelatin member, ya third arm fixedly mounted on said shaft, a roller rotatably mounted on said third arm, and a cam rotating with said drum adapted by engagement with said last-named roller to move said second roller outwardly in timed relation for engaging saidv copy sheet with said .stripping roller.

WILLIS A. KROPP. 

